1. An "unlucky" coin found on the ground. "Unlucky" or not, your amount of money was just incremented.
2. In reference to a "dime": a woman whose body is a ten but whose face is debatable.
3. Doggy style.
1. I found a quarter on the ground. It was tail side up, but that didn't change me buying a soda.
2. Girl's a dime, but tail side up.
3. I'm 'bout to get at that bitch tail side up.